Yes a good RDM should have a set where every (nearly every) slot is covered in MND for Slow and para. On the right mobs (which TBH with capped merits etc is a lot more than you first think) a 120+MND build makes slow very useful.
The only slots I keep skill are head (where I use my D.Chap) and 1 ear (where I use my enfeebling earring as I only have 1 MND earring).
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